Generate Set of Random Integers from Interval in R (2 Examples)

In this article, I’ll demonstrate how to sample random integers from an interval in the R programming language.

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Example 1: Sample Random Integers from Range without Replacement

The following R programming syntax demonstrates how to generate a set of unique random integers (i.e. sampling without replacement).

As a first step, we should set a random seed for reproducibility:

set.seed(2893755)                # Set random seed

In the next step, we can apply the sample.int function to draw random integers in a certain range. Within the sample.int function, we are specifying a range between 1 and 10 (i.e. n = 10) and a sample size of 5 (i.e. size = 5):

my_int1 <- sample.int(n = 10,    # Generate random integers
                      size = 5)
my_int1                          # Print vector of random integers
# [1] 9 5 3 7 8

The previous vector shows our result: We have created a vector with a length of 5 containing random integers.

Example 2: Sample Random Integers from Range with Replacement

The following R code shows how to draw random integers with replacement.

For this, we have to specify replace = TRUE within the sample.int function:

my_int2 <- sample.int(n = 10,    # Generate random integers
                      size = 5,
                      replace = TRUE)
my_int2                          # Print vector of random integers
# [1] 9 9 3 1 4

As you can see based on the previous output, we have created another vector containing five random integers. The value 9 has been drawn twice.

Video, Further Resources & Summary

I have recently released a video on my YouTube channel, which illustrates the contents of this tutorial. You can find the video below:

Also, you might read some of the other tutorials on this website:

• Create Random Matrix in R
• Generate Multivariate Random Data in R
• Randomize Vector in R
• Why & How to Set a Random Seed
• Generate Multivariate Random Data in R
• R Programming Language

At this point you should have learned how to sample random integers from a range in the R programming language. In case you have additional questions, don’t hesitate to let me know in the comments below.